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Yamaha MS400, Service Manual, Page: 7 / 31

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Yamaha MS400 Service Manual Download Page 7

MS400

7

WIRING

1/5

Speakers

WF

TW

CN203

CN201

CN202

CN103

5/5

CN102

CN101

4/5

Transformer

CN204

3/5

CN205

P.SW

AC.IN

2/5

YE

BL

CN208

Coil

H only

AMP

AMP

AMP

AMP

AMP

www. xiaoyu163. com

QQ 376315150

9

9

2

8

9

4

2

9

8

TEL 13942296513

9

9

2

8

9

4

2

9

8

0

5

1

5

1

3

6

7

3

Q

Q

TEL  13942296513  QQ  376315150  892498299 

TEL  13942296513  QQ  376315150  892498299 

http://www.xiaoyu163.com

http://www.xiaoyu163.com

Summary of Contents for MS400

Page 1: ...ONS 4 BLOCK DIAGRAM 4 PANEL LAYOUT 5 CIRCUIT BOARD LAYOUT 6 WIRING 7 DISASSEMBLY PROCEDURE 8 IC BLOCK DIAGRAM 10 CIRCUIT BOARDS 11 INSPECTIONS 16 OVERALL CIRCUIT DIAGRAM 19 PARTS LIST MS400 www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http ...

Page 2: ...to exist please contact the distributor s Service Division WARNING Static discharges can destroy expensive components Discharge any static electricity your body may have accumulated by grounding yourself to the ground bus in the unit heavy gauge black wires connect to this bus IMPORTANT Turn the unit OFF during disassembly and parts replacement Recheck all work before you apply power to the unit W...

Page 3: ... impedance LINE 30 kohms MIC 5 kohms Controls LEVEL LINE MIC MASTER EQ LOW 0 Max 10 dB Min at 55 Hz HIGH 3 dB HF Power switch On Off Connectors all balanced LINE in out XLR 3 31 XLR 3 32 phone They are all connected in parallel and can be used as line outputs MIC in XLR 3 31 POWER indicator Green LED Power Requirement USA and Canada 120 V 60 Hz Europe 230 V 50 Hz Others 240 V 50 Hz Power Consumpti...

Page 4: ...LPF HPF Freq response compensation LF HF SPEAKER SPEAKER Line Input Output LOW EQ HIGH EQ Phone Jack HPF AMP 4 5 AMP 5 5 AMP 1 5 CN102 6 CN101 6 CN102 4 CN101 4 CN201 6 CN103 6 CN201 4 CN203 3 LF CN203 4 LF CN203 1 HF CN203 2 HF CN103 4 www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 3...

Page 5: ...NE connectors LINE LEVEL control MIC connector MIC control MASTER LEVEL control POWER indicator TONE CONTROL Rear Panel www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 6: ...5 AMP AMP AMP AMP AMP www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 7: ... 3 5 CN205 P SW AC IN 2 5 YE BL CN208 Coil H only AMP AMP AMP AMP AMP www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 8: ...emoved Fig 1 3 4 To remove the 25mm speaker remove the four 4 screws marked 120 Then remove the speaker with the bracket Fig 1 3 5 Remove the two 2 screws marked 100 The 25mm speaker can then be removed from the bracket Fig 1 70 Hexagonal Bolt 5 0 X 35 MFZN2BL V6389200 120 Bind Head Tapping Screw P 5 0 X 30 MFZN2BL V6405200 170 Bind Head Tapping Screw P 5 0 X 50 MFZN2BL V6084800 180 Bind Head Scre...

Page 9: ...ZN2BL V7242900 2 Circuit Board 130 Bind Head Screw 4 0 X 8 MFZN2BL VP156800 1 AMP3 5 110A Bonding Screw B 3 0 X 8 MFZN2BL VN413300 2 Circuit Board AMP4 5 110B Bonding Screw B 3 0 X 8 MFZN2BL VN413300 6 Circuit Board Hexagonal Nut 1 AMP5 5 150 Knob MX GREEN D GRAY VU860200 2 Circuit Board 160 Knob ORANGE D GRAY VV625800 2 170 Knob RED D GRAY VU860400 1 200 Button 3 X 25 MFZN2BL V3289800 4 PCB Name ...

Page 10: ...ove the AMP 1 5 circuit board See Step 4 2 7 3 Remove the three 3 screws marked 120 The heat sink can then be removed Fig 2 80 70 NJM2068L D XM356A00 NJM4580L XF195A00 Operational Amplifier IC101 103 104 105 106 107 108 IC102 1 A 2 3 4 5 6 7 8 IN V IN OUT A A A V IN IN OUT B B B B www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 1394229651...

Page 11: ...ransformer CN203 to SPEAKER Notes VR201 VR202 Idling Adjustment VR www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 12: ...ern side www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 13: ...de AC IN PSW AMP2 5 Circuit Board AMP3 5 Circuit Board Component side Pattern side Pattern side www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 14: ... 50dB Pattern side Component side 3NA V606200 www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 15: ... LEVEL HIGH to AMP4 5 CN101 Component side AMP5 5 Circuit Board 3NA V606200 www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 16: ...applied It should be within 70mV both at LF between Pins 1 and 2 and at HF between Pins 3 and 4 4 Gain Efficiency Input a 500Hz 1dBu signal to the input terminal Line INPUT XLR and check that the output voltage at the output terminal LF is 28 1dBu Also check that the primary side power consumption at this time is 180 30W 5 Full harmonic distortion Input a 500Hz signal to the input terminal LINE IN...

Page 17: ...dard 0dB MAX 3 2 5dB 1dB MIN 3 3 5dB 1dB 9 Tone control low change characteristic Input a 50kHz 20dBu signal to the input terminal LINE INPUT XLR move the tone control low VR and check that the output voltage measured at the output terminal LF then is as follows using the output voltage when the VR is at the MAX position as standard 0dB the MAX position as standard 0dB MIN 10 9dB 1dB 10 MIC input ...

Page 18: ...ise such as vibration noise occurs Next input music signals to the input terminal LINE INPUT XLR move each VR knob and check that the sound volume and tone quality change smoothly without producing noise 2 Phase of speaker output Check that the output at LF is in positive phase with respect to the input signal and the output at HF is in negative phase with respect to the input signal www xiaoyu163...

Page 19: ...REGULATOR N C N C N C AC IN NJM7815FA XD853A00 REGULATOR 2 3 1 NJM7915FA XD854A00 1 OUTPUT 2 COMMON 3 INPUT 2 2 GND 1 INPUT 3 OUTPUT 1 3 REGULATOR 15V Mica Capacitor Metal Film Resistor Flame ProofC Resister AMP AMP AMP w w w x i a o y u 1 6 3 c o m Q Q 3 7 6 3 1 5 1 5 0 9 9 2 8 9 4 2 9 8 T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL...

Page 20: ...MP 1 5 OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP OP AMP AMP AMP w w w x i a o y u 1 6 3 c o m Q Q 3 7 6 3 1 5 1 5 0 9 9 2 8 9 4 2 9 8 T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 21: ...t number is O not zero The second letter of the shaded part number is I not one M South African model O Chinese model Q South east Asia model T Taiwan model U U S A model V General export model 110V W General export model 220 N X General export model Y Export model A Australian model B British model C Canadian model D German model E European model F French model H North European model I Indonesian...

Page 22: ...180 220 260 190 200 C100 220d 220c 220a 220b C60 C80 C30 C40 AMPLIFIRE ASSEMBLY See page 4 www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 23: ...0620 2 210 Label U VV94530 220 Front Gril Assembly J V640500 220a Front Grile 220b Rogo Plate 220c Bush Nut SPN 4 2 220d Cushion 4 250 Bolt Cover H V629020 2 260 Grille Sticker CABINET ASSEMBLY Cabinet Assembly J V640490 C10 Speaker Cabinet C20 Bolt 12X20 MFZN2BL V608450 2 C30 Hexagonal Frange Nut 12 2 C40 Flat Washer 12X35 MFZN2Y 2 C60 Handle 2 C70 Bind Head Screw 5 0X35 MFZN2BL 4 01 C80 Hexagona...

Page 24: ... 140 20 130 110 10c 10d 10b AMPLIFIRE ASSEMBLY www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 25: ...2 MFZN2BL 6 01 90 Bind Head Tapping Screw B 3 0X12 MFZN2BL 01 100 Bind Head Screw SP 3 0X8 MFZN2Y 4 01 110 Bounding Screw B 3 0X8 MFZN2BL 8 01 120 Bounding Screw B 4 0X8 MFZN2BL 3 01 130 Bind Head Screw 4 0X8 MFZN2BL 01 140 Rear Panel J 140 Rear Panel UV 140 Rear Panel H 140 Rear Panel A 150 Knob MX GREEN D GRAY TONE CONTROL LOW HIGH 2 01 160 Knob ORANGE D GRAY LINE LEVEL MIC LEVEL 2 01 170 Knob R...

Page 26: ...C133 Ceramic Cap F 0 0100 50V Z 01 C134 Ceramic Cap F 0 0100 50V Z 01 C135 Mylar Cap 0 010 50V J 01 C136 Ceramic Cap F 0 0100 50V Z 01 C137 Mylar Cap 0 068 50V J 01 C138 Mylar Cap 0 012 50V J 01 C139 Ceramic Cap F 0 0100 50V Z 01 C140 Ceramic Cap F 0 0100 50V Z 01 C141 Mylar Cap 0 056 50V J 01 C142 Ceramic Cap F 0 0100 50V Z 01 C143 Ceramic Cap F 0 0100 50V Z 01 C144 Mylar Cap 0 015 50V J 01 C145 ...

Page 27: ...00V K 01 C265 Ceramic Cap B 0 0022 500V K 01 C266 Electrolytic Cap 100 100 0V C267 Electrolytic Cap 100 100 0V C269 Capacitor 1000P 400V J U C S 01 C270 Ceramic Cap F 0 0100 50V Z 01 C271 Ceramic Cap F 0 0100 50V Z 01 CN101 Connector Assembly IN V606240 CN102 Connector Base Post M24185XX 6P TE CN103 Connector Assembly PWR V606250 CN201 Connector Base Post M24185XX 6P TE CN202 Base Post 6P TE 01 CN...

Page 28: ...ansistor 2SC4793 HFE 03 Q218 Transistor 2SC3468 D E 01 Q219 Transistor 2SA1371 D E 01 Q220 Transistor 2SA1371 D E 01 Q221 Transistor 2SC3468 D E 01 Q222 Transistor 2SC3468 D E 01 Q223 Transistor 2SA1371 D E 01 Q224 Transistor 2SA1371 D E 01 Q225N Pair Transistor A1859A C4883A 04 Q225P Pair Transistor A1859A C4883A 04 Q226N Pair Transistor A1859A C4883A 04 Q226P Pair Transistor A1859A C4883A 04 Q22...

Page 29: ...tal Film Resistor 3 3K 1 4 F R134 Metal Film Resistor 18K 1 4 F R135 Metal Film Resistor 20K 1 4 F 05 R136 Metal Film Resistor 10K 1 4 F 01 R137 Metal Film Resistor 820 0 1 4 F R138 Carbon Resistor 18 0 1 4 J 01 R139 Metal Film Resistor 15K 1 4 F 01 R140 Metal Film Resistor 5 6K 1 4 F 01 R141 Metal Film Resistor 680 0 1 4 F 01 R142 Metal Film Resistor 120K 1 4 F R143 Metal Film Resistor 1K 1 4 F 0...

Page 30: ... K 276 Cement Resistor 0 22 5W K R277 Flame Proof C Resistor 4 7 1 4 J 01 R278 Flame Proof C Resistor 4 7 1 4 J 01 R279 Cement Resistor 0 22 5W K R280 Cement Resistor 0 22 5W K R281 Carbon Resistor 47 0K 1 4 J 01 R282 Carbon Resistor 47 0K 1 4 J 01 R283 Carbon Resistor 10 0K 1 4 J 01 R284 Carbon Resistor 22 0K 1 4 J 01 R285 Carbon Resistor 47 0K 1 4 J 01 R286 Carbon Resistor 150 0K 1 4 J 01 R287 C...

Page 31: ...ariable Resistor B 50 0K RD09F113 High 01 VR201 Trimmer Potentiometer B 470 3P RHEOA idling 01 VR202 Trimmer Potentiometer B 470 3P RHEOA idling 01 W201 Connector Assembly AC V606230 ZD201 Zener Diode MTZ J 6 8C 6 8V 01 204 Zener Diode MTZ J 6 8C 6 8V 01 Power Transformer E J Power Transformer UL CSA E UV Power Transformer CEE H Power Transformer CEE A AC Cord BS H05VV F3X0 75 B AC Cord UC SJT 18X...

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